Continuity mistake: During the opening credits, Frasier, Martin, and Daphne are sitting at the table talking about getting older. At one point Martin says "when people reach our stage in life" and his left hand is holding his coffee cup. But as the camera cuts to Frasier we can see Martin's hand in the left corner of the screen, up in the air, without the cup. The next shot shows it back on the table, holding the cup again. All this happens too quickly for the changes in real time.
Visible crew/equipment: Towards the end of the show, Marty and Frasier are sitting in the living room talking. Eddie is curled up right next to Frasier on the couch. There are a number of shots focused on Frasier and Eddie and on the bottom of the screen one can see something flick by a couple of times - and in one shot there is definitely a couple of inches of a grey metal pole of some sort, about the thickness of a broom handle.